Swingletree or doubletree.



No 790,727. PATENTED MAY 23, 1905. B. HAIMAN.

SWINGLETREE ,OR DOUBLETREE.

1 v APPILIOATION FILED NOV. 7, 1904.

WITNESSES: I HVVENTOR. 6:4 7 0/ v B y M) 'WMQ/L W ATTORNEY.

NiTEn STATES Patented May 23, 1905.

SWINGLETQREE on DOUBLETREE.

SPECIFICATION forming part of Letters Patent N 0. 790,727, dated May 23, 1905.

Application filed November 7, 1904. Serial No. 231,649.

To (tZZ whom, it may concern.-

Be it known that I, ELIAs HAIMAN, a citizen of the United States, residing at Cleveland, in the county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Swingletrees or Doubletrees; and I do declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to swingletrees and doubletrees, and is an improvement on the construction set forth in Letters Patent of the United States issued to me April 18, 1904:, and numbered 757,866.

In the accompanying drawings, Figure 1 is a plan view of my improved swingletree or doubletree bar. Fig. 2 is a rear view of one end of the bar enlarged, and Fig. 3 is a crosssection thereof on a line corresponding to w m, Fig. 1. Fig. 4 is a plan view of one end of a modification of the bar, and Fig. 5 is a rear edge elevation of the construction shown in Fig. 4:-

As thus shown, A represents a swingletree or doubletree, as either may he wanted, and is referred to herein as a bar or draft-bar. The bar shown in Fig. 1 is formed from a single strip of heavy sheet metal, preferably steel, cut to the required shape and size and bent longitudinally to give it a substantially U shape in cross-section between its ends; but in this instance and for the purpose of the present improvement having the sides a of the ends brought fiat together, as seen at a (0, Fig. 12?, and extending back to diagonal line y y,

Now in order to make engagement with the hooks C more convenient or accessible than in the former construction above referred to, as well as to render such engagement most effective against accidental displacement of the trace-chain or other attachment D, I provide for entering the eye 0 of the hook through a notch 0, formed in the rear edge of the bar and which is inward from the end of the bar and the eye 0 relatively, as shown, and opens into an inclined internal slot or channel 0 through which passage into eye 0 is obtained.

The said slot or channel 0 extends past notch 0 at its upper end under projection 0 so as to form a trap or catch within said projection and in which the attachment D will generally be caught if it should he accidentally thrown out past the inwardly-turned point 0 of the hook. This makes a construction which renders engaging and disengaging of attachment D comparatively easy by hand, but safe and secure as against accidental release.

In Figs. 4 and 5 I show a modification of the invention in which the hook portion O is constituted a separate piece or part riveted in between the flattened sides a at the ends of the bar A and when in place constituting a fixed and permanent portion thereof the same as integral hook O. Otherwise all the details of the hook are identically the same as in Fig. 1, and the hook in both cases springs from the front of the bar and extends rearward and has its extremity running inward past the outer edge a or a and terminating on one side of inclined channel or slot 0 within and past the entrance-notch c. This forms a substantially keyhole construction in what may be regarded as the hook portion proper of the bar for entering, releasing, and confining the attachment- D.

A clevis E or other connecting part is fixed between the sides of the bar A at its middle by means of a rivet or other suitable means.

It will be noticed as a feature of this construction of draft-bar that the U-shape formation thereof extends into the base of the hook and terminates in the extreme end of the bar, so that the hook has the advantage of this formation for its own strength under excessive strain, and the flattened portion of the bar comes mostly at that point where there is no real strain upon the hook.

What I claim is- 1. As a new article of manufacture, a draftbar formed from sheet metal bent into substantially U shape in cross-section between its ends and having its ends flattened and formed with hooks and inclined slots leading to the hooks and notches in the rear edges of the bar open to said slots between the ends thereof.

I 2. A draft-bar U shape in cross-section and In testimony whereof I sign this specificahaving the rear portion of its ends pressed tion in the presence of two witnesses. fiatwise together and provided with a hook having its entrance through said flattened 5 portion and the swell of the bar terminating Witnesses:

in the base of the hook, thereby strengthen- R. B. MOSER, ing the hook at its point of greatest strain. C. A. SELL.

ELIAS HAIMAN. 

